JP2018146040A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive filter capable of realizing smooth circulation for lubricant and secure capture of foreign matter.SOLUTION: A rolling bearing includes: an inner ring 1; an outer ring 2; a rolling body 3 arranged in a bearing space between the inner ring 1 and the outer ring 2; a filter part F configured to allow passage of lubricant and prohibit passage of foreign matter between the inside and outside of the bearing space; and a flock part 20 provided in the filter part F. The flock part 20 is, for example, provided on an inner surface 6a of a through hole 6 the filter part F includes, or in a case that the filter part F is a mesh member where wires are connected in a lattice manner to form a through hole, provided on the wires of the mesh member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an oil lubricated rolling bearing.

  Rolling bearings are incorporated in movable parts of transportation equipment, industrial machinery, and other various equipment. The rolling bearing has a structure that is lubricated by lubricating oil filled in the bearing space.

  Incidentally, foreign matter such as wear powder (iron powder or the like) may be generated from the bearing space of the rolling bearing. If such foreign matter is included in the lubricating oil, the durability of the device may be reduced. Therefore, for example, Patent Document 1 proposes a technique of a rolling bearing with a filter that captures foreign matters contained in lubricating oil by providing a filter on a seal ring attached to the rolling bearing. This filter is provided with a through-hole, and the through-hole is set to a size that allows the lubricating oil to pass through but does not allow foreign matter to pass through.

  However, if the size of the through hole is too large, the lubricating oil can easily pass through, but there may be a situation in which foreign matter that affects the durability and life of the operating mechanism and the rolling bearing cannot be captured. On the other hand, if the size of the filter through-hole is too small, clogging is likely to occur due to the trapped foreign matter, and a situation where smooth circulation of the lubricating oil is hindered may occur. For this reason, an appropriate size of the through hole is set so that harmful foreign substances can be reliably captured and clogging is not caused by the foreign substances.

  Further, for example, in Patent Document 2, when a foreign substance made of iron powder or the like is mixed in lubricating oil flowing in the circulation path, the foreign substance is attracted to a magnet provided in the sensor, and the adsorbed foreign substance accumulates. Thus, there is disclosed a method for detecting iron powder contamination of lubricating oil that issues an alarm when a metal casing and a magnet are electrically connected.

JP 2012-211691 A JP 7-280180 A

  As in Patent Document 1, the through hole of the filter must be set to an appropriate size according to the application and specifications of the rolling bearing. However, there is a limit in reducing the size of the filter through-hole in order to catch smaller foreign matters and the like due to problems in the filter manufacturing process and cost.

  In addition, there is a contradictory relationship in setting the size of the through hole that the through hole is enlarged and the lubricating oil is smoothly circulated and the through hole is made small and the foreign matter is reliably captured. For this reason, it is often difficult to achieve both smooth distribution of the lubricating oil and reliable capture of foreign matter.

  Further, in the technique described in Patent Document 2, most of the foreign matters contained in the lubricating oil in the circulation path may pass by without adsorbing to the magnets and electrodes of the sensor. For this reason, it is effective to install the electrode in the vicinity of the filter. However, providing the electrode in the filter having a large number of through holes has a problem that there are many restrictions due to problems of the strength of the filter material and installation space.

  In view of this, the first object of the present invention is to realize a filter that can achieve both smooth circulation of lubricating oil and reliable capture of foreign matter at a low cost, and a sensor for detecting foreign matter contained in lubricating oil can be easily used as a filter. The second problem is to make it possible to install in

  In order to solve the above-described problems, the present invention permits passage of lubricating oil between an inner ring and an outer ring, a rolling element disposed in a bearing space between the inner ring and the outer ring, and an inner and outer sides of the bearing space. A rolling bearing provided with a filter portion that prevents passage of foreign matter and a flocked portion provided in the filter portion is employed.

  Here, the said hair transplant part can employ | adopt the structure provided in the inner surface of the through-hole with which the said filter part is provided.

  Moreover, the said filter is a mesh member which connected the wire to the grid | lattice form, and formed the said through-hole, and the said hair transplant part can employ | adopt the structure provided in the wire of the said mesh member.

  In each of these aspects, the filter may include a plurality of sizes of through holes having different inner diameters, and the flocked portion may be provided only in the through holes having a predetermined inner diameter or more.

  The length of the fiber of the said hair transplant part provided in the inner surface of a through-hole can employ | adopt the structure set longer than the internal diameter of the said through-hole which provides the said hair transplant part.

  In each of these aspects, it is possible to adopt a configuration in which the planting direction from the root part to the tip part of the fibers of the flocked part is perpendicular to the direction in which the through holes extend. Or the structure which inclines the planting direction from the root part of the fiber of the said hair transplant part to the front-end | tip part with respect to the direction where the said through-hole extends in the flow direction of the said lubricating oil is employable.

  Furthermore, in addition to the inner surface of the through hole, the flocked portion has a surface facing the bearing space around the through hole and a surface facing the outside of the bearing space around the through hole, or a surface on either side thereof. The structure provided in can be adopted.

  In each of these embodiments, a configuration in which static electricity or magnetism is attached to the fibers of the flocked portion can be employed. Moreover, the structure which apply | coated the oiling agent to the fiber of the said hair transplant part is employable.

  Furthermore, in each of these embodiments, the flocked portion includes a first flocked portion and a second flocked portion made of conductive fibers, and the first flocked portion and the second flocked portion are used as electrodes, respectively, from both electrodes. The state of the foreign matter contained in the lubricating oil is detected by detecting the change in the electrical output of the electrical circuit that accompanies the adhesion of the foreign matter between the electrodes and the electrical circuit that extends to the power source. A configuration including a control device can be employed.

  In this invention, since the flocked portion is provided in the filter portion of the seal ring provided in the axial direction opening portion of the bearing space, it is possible to realize a filter that can achieve both smooth circulation of the lubricating oil and reliable capture of the foreign matter at low cost. it can. Moreover, when detecting the mixing state of a foreign material by the change of the electrical output by the adhesion of the foreign material between a pair of electrodes, the first hair transplanted portion that is made up of electrically conductive fibers and separated from each other, And since the 2nd hair transplant part was made into the pair of electrodes, the sensor which detects a foreign material can be easily installed in a filter.

1 shows an embodiment of the present invention, (a) is a sectional view, (b) is an enlarged sectional view of a main part. A perspective view of a seal ring having a flocked part in the filter part (A)-(c) is principal part expanded sectional drawing which shows the modification of the flocked part in a filter part. The principal part expanded sectional view which shows the modification of the further flocked part (A) and (b) are principal part expanded sectional views which show the modification of the further flocked part. The flocked part when a filter part is comprised with a mesh member is shown, (a) is a front view, (b) is a side view. The other embodiment of this invention is shown, (a) is sectional drawing, (b) is principal part expanded sectional drawing. The front view which shows embodiment provided with the sensor for detecting a foreign material in a filter part

  Embodiments of the present invention will be described with reference to the drawings. In this embodiment, the seal ring 5 provided in the axial opening of the bearing space is provided with a filter part F, and the filter part F is a rolling bearing 10 provided with a flocking part 20.

  In the configuration of the rolling bearing 10, a plurality of rolling elements 3 are arranged in an annular bearing space between an inner ring 1 and an outer ring 2 which are raceways. The rolling element 3 is held along the circumferential direction by a cage 4 disposed in the bearing space. The bearing space is filled with lubricating oil.

  Lubricating oil is supplied into the bearing space of the rolling bearing 10 from one axial opening of the bearing space. Further, the lubricating oil in the bearing space flows out from the inside and outside of the bearing space through the other axial opening of the bearing space.

  Foreign matter such as wear powder (iron powder or the like) may be generated from the bearing space of the rolling bearing 10. It is desirable that this foreign material does not float in the lubricating oil, but is captured at any location and held there. Therefore, the seal ring 5 with the filter portion F is attached to the axial opening on either side of the bearing space, or both axial openings. In this embodiment, as shown in FIG. 1, seal rings 5 are attached to both axial openings.

  As shown in FIG. 2, the seal ring 5 has an annular shape so as to cover the axial opening of the bearing space. A large number of through holes 6 are formed over the entire circumference of the side wall portion of the annular seal ring 5, and an annular filter portion F is constituted by these through holes 6. The filter portion F is set to have a size and a shape of the inner diameter of the through hole 6 so as to allow the passage of the lubricating oil between the inside and outside of the bearing space and prevent the passage of foreign matter.

  Although metal, rubber, or the like can be used as the material of the seal ring 5, the seal ring 5 of this embodiment is made of a synthetic resin molded product. A resin seal ring 5 is fixed to the inner ring 1 or the outer ring 2. In the embodiment shown in FIGS. 1 and 2, a deep groove ball bearing using balls as rolling elements 3 is employed as the rolling bearing 10. The seal ring 5 is fixed to one of the race rings, and the tip thereof is in sliding contact with the opposite race ring, or the tip is opposed to the opposite race ring with a minute gap. . Reference numeral 7 in the drawing denotes an outer diameter side end of the seal ring 5, and reference numeral 8 denotes an inner diameter side end of the seal ring 5.

  Here, when the outer ring 2 is on the fixed side, the outer diameter side end 7 of the seal ring 5 is fixed to the outer ring 2 on the fixed side by fitting or the like. It is also possible to fix the inner diameter side end 8 to the inner ring 1 on the rotation side by fitting or the like. When the inner ring 1 is on the fixed side, the inner diameter side end 8 of the seal ring 5 is fixed to the inner ring 1 on the fixed side by fitting or the like. Instead, the outer diameter of the seal ring 5 is fixed. It is also possible to fix the side end 7 to the outer ring 2 on the rotating side by fitting or the like.

  The filter part F is provided with a flocking part 20. In the embodiment shown in FIGS. 1 and 2, the flocked portion 20 is provided on the inner surface 6a of the through hole 6, the root portion of the fiber is fixed to the inner surface 6a, and the tip portion of the fiber is a free end. By providing the flocked fiber on the inner surface 6a of the through hole 6, foreign matter such as wear powder having a size entering the through hole 6 can be captured by the fiber.

  In general, it is not easy to manufacture a filter portion having a large number of minute through holes by using a material such as resin, rubber, metal, or the like, but the inner diameter of the through holes 6 can be substantially reduced by adopting the flocked portion 20. An effect can be expected, and manufacture of the filter part F becomes easy. Further, although the flocked portion 20 captures foreign matters smaller than the inner diameter of the through hole 6, the inner diameter of the through holes 6 of the filter portion F is temporarily reduced in response to the small foreign matter with respect to the flow of the lubricating oil. Compared to the case, it is relatively difficult to cause flow resistance. For this reason, the distribution | circulation of favorable lubricating oil is securable.

  In addition, as shown in FIG. 2, the planting direction from the fiber root part to the tip part of the flocking part 20 is inclined downstream with respect to the flow direction A of the lubricating oil along the direction in which the through holes 6 extend. Therefore, also in this respect, it is possible to ensure a good circulation of the lubricating oil.

  Here, the length and thickness of the fibers to be planted are determined based on the required flow rate and cleanliness of the lubricating oil. That is, the resistance applied to the lubricating oil passing through the through-hole 6 increases as the fiber length of the flocked portion 20 increases or the fiber thickness increases. On the other hand, the longer the fiber length of the flocked portion 20 is, or the thicker the fiber is, the higher the performance of capturing foreign matter. For this reason, the length and thickness of the fiber are determined in consideration of both the required flow rate of the lubricating oil and the required cleanliness of the lubricating oil (how much foreign matter is allowed to intervene). To do.

  The modification of the hair transplant part 20 is shown below from FIG.

In the example of FIG. 3A, the fiber length W ₁ of the flocked portion 20 (hereinafter referred to as “inner surface flocked portion 21”) provided on the inner surface 6 a of the through-hole 6 is defined as the through-hole 6 provided with the flocked portion 20. set longer than the inner diameter W _0, to enhance the trapping effect of the foreign matter.

  Further, in the example of FIG. 3B, the flocked portion 20 is arranged on either one of the surface facing the bearing space around the through hole 6 or the surface facing the outside of the bearing space around the through hole 6. On the surface. Hereinafter, the flocked portion 20 provided on the one side surface is referred to as a one-side flocked portion 22. The one side flocked portion 22 can capture foreign matters floating around the through hole 6. In this example, the one-side flocked portion 22 is provided on the side facing the flow direction A of the lubricating oil, but the one-side flocked portion 22 is opposite to the side facing the flow direction A of the lubricating oil. It may be provided on the surface.

  Depending on the installation location of the filter part F, the surface facing the flow direction A of the lubricating oil may be a surface facing the bearing space or a surface facing the outside of the bearing space. Moreover, depending on the application and specification of the rolling bearing 10, the flow direction A of the lubricating oil may constantly change, and the direction may not be specified.

  Further, in the example of FIG. 3C, the flocked portion 20 is on the surface facing the bearing space around the through hole 6 or on both sides of the surface facing the outside of the bearing space around the through hole 6. Provided. Hereinafter, the flocked portion 20 provided on the surface opposite to the surface of the one-side flocked portion 22 is referred to as the other-side flocked portion 23. In addition to the one-side flocked portion 22, the other-side flocked portion 23 can more effectively capture foreign matters floating around the through hole 6.

  Moreover, when clogging in the through-hole 6 of the filter part F becomes a problem, as shown in FIG. 4, the planting direction from the root part of the fiber of the inner surface flocking part 21 to the front-end | tip part is shown. It can be perpendicular to the direction of extension. At this time, it is good to set it as the fiber length which the front-end | tips of the fiber which the inner surface flocking part 21 opposes between the opposing surfaces in the through-hole 6 do not mutually contact. At this time, the one side flocked part 22 and the other side flocked part 23 may be provided together (the same applies to each embodiment and modification).

  That is, as the performance required for the filter portion F, when emphasizing the cleaning of the lubricating oil, the fiber planting direction of the inner surface flocked portion 21 is directed downstream or upstream along the lubricating oil flow direction A. It is effective to incline. When emphasizing the prevention of clogging of the through holes 6, it is effective to set the fiber planting direction of the inner surface flocked portion 21 in a direction perpendicular to the lubricating oil flow direction A.

  In the example shown in FIG. 5A, the filter portion F includes through holes 6 and 6 'having a plurality of sizes having different inner diameters, and the flocked portion 20 is provided only in the through holes 6 having a predetermined inner diameter or more. Yes. In this example, through holes 6 and 6 ′ having two types of inner diameters are provided, and only the through holes 6 having a relatively large inner diameter (greater than a predetermined inner diameter) are provided with the flocked portion 20 and are relatively small. The flocked portion 20 is not provided in the through hole 6 ′ having an inner diameter (less than a predetermined inner diameter). By limiting the through-holes 6 in which the flocked portions 20 are provided to those having a predetermined inner diameter or more, it is possible to average the foreign matter capturing performance between the plurality of through-holes 6 and 6 ′ having different sizes.

  In the example shown in FIG. 5B, the shape of the through hole 6 is a long hole. The longitudinal through holes 6 are arranged in parallel in the same direction to form a slit-shaped filter portion F. A flocked portion 20 is provided on the inner surface 6a of the through-hole 6 made of a long hole. In addition, the arrangement | positioning location and direction of the fiber of the flocking part 20 can employ | adopt the thing similar to each example shown in FIGS.

  In the example shown in FIG. 6, the filter portion F is configured by a mesh member in which the through holes 6 are formed by connecting wire rods in a lattice shape. As the material of the mesh member, resin, metal, or the like can be used. The filter portion F made of a mesh member has its peripheral portion fixed to the resin constituting the seal ring 5 by an insert molding structure or a fitting structure. In addition, also when the raw material which comprises the seal ring 5 is a metal and rubber | gum, the filter part F which consists of mesh members can be fixed by the same method.

  The flocked part 20 is provided on the wire of the mesh member of the filter part F. By performing flocking on the wire of the mesh member, the effect that the inner diameter of the through hole 6 can be substantially reduced can be expected as in the above examples, and the manufacture of the filter portion F becomes easy.

  In the method for forming the flocked portion 20, an adhesive layer is formed on the target surface on which the flocked portion 20 is provided, fibers are planted on the adhesive layer, and the fibers are fixed by solidifying the adhesive layer.

  At this time, an electrostatic flocking technique can be employed in which an electrostatic field is created by the high voltage electrode and the fibers are implanted on the target surface where the flocked portion 20 is provided by the electrostatic attraction force. For example, a large number of short fibers to be attached are placed on the electrode plate, and a base material having a target surface for flocking is arranged at a slight distance. When a high voltage is applied between the base material (for example, the plus side) and the electrode plate (for example, the minus side), an electric field is generated by the high voltage, and polarization occurs in the short fiber. As a result, the negative charges of the short fibers are attracted to the base material on the positive side, and the fibers adhere to the adhesive layer. At this time, the fibers are fixed in a state where they are pierced into the adhesive layer so as to be perpendicular to the target surface.

  Moreover, the method (electrostatic spraying flocking) which sprays a fiber on an adhesive bond layer with air can also be employ | adopted. In other words, when the charged fibers are attached to the adhesive layer on the target surface by electrostatic attraction force, if the fibers are blown with air, the fibers are bonded at an angle with respect to the surface direction of the target surface. It becomes fixed to the agent layer.

  The fiber material used for the flocked part 20 includes (1) synthetic resin fibers (polyolefin resins such as polyethylene and polypropylene, polyamide resins such as nylon, aromatic polyamide resins, polyethylene terephthalate, polyethylene naphthalate, polyethylene succinate, and polybutylene. Polyester resin such as tephrate, fiber made of synthetic resin such as acrylic resin, vinyl chloride resin, vinylon resin, etc.), (2) inorganic fiber (for example, carbon fiber, glass fiber, etc.), (3) recycled fiber (rayon, Acetate), (4) natural fibers (cotton, silk, hemp, wool, etc.) can be used, but synthetic resin fibers are preferred. When synthetic resin fibers are used as the fiber material, swelling and dissolution of the fiber material due to hydraulic oil can be prevented, and the cost is low.

  The thickness of the fiber can be set in the range of 0.5 to 50 dtex. Moreover, the fiber flocking density (area ratio of the fiber material 35 in the flexible structure 33) can be set in a range of 101 to 30%. The fiber may be of a straight shape (linear shape over the entire length) or a bend shape (bent shape). Moreover, what has a circular cross section or a polygonal cross section can be employ | adopted for a fiber. Bend-shaped fibers have a higher ability to retain a lubricant than straight-shaped fibers. Moreover, since the fiber of polygonal cross-sectional shape has a large surface area compared with the fiber of circular cross section, the capability to hold | maintain a lubricant is high. For this reason, when expecting the smooth flow of lubricating oil, it is desirable that the fiber has a straight shape and a circular cross section.

  The adhesive layer is formed of an adhesive mainly composed of a resin such as urethane resin, epoxy resin, acrylic resin, vinyl acetate resin, polyimide resin, or silicone resin. Examples of adhesives include urethane resin solvent-based adhesives, epoxy resin solvent-based adhesives, vinyl acetate resin solvent-based adhesives, acrylic resin-based emulsion adhesives, acrylate-vinyl acetate copolymer emulsion adhesives, and acetic acid. Examples thereof include vinyl emulsion adhesives, urethane resin emulsion adhesives, epoxy resin emulsion adhesives, polyester emulsion adhesives, and ethylene-vinyl acetate copolymer adhesives.

  In order to capture foreign matter such as abrasion powder more reliably by the flocking part 20, it is effective to attach static electricity or magnetism to the fibers to be flocked. The application of static electricity or magnetism to the fiber can be performed by a well-known method before or after the fiber is implanted.

  Further, in order to effectively prevent clogging of the through holes 6, it is effective to make the flocked portion 20 an oleophobic flocked portion by applying an oiling agent to the fibers to be flocked. The application of the oiling agent can be performed by a well-known technique before or after fiber implantation.

  In the above embodiment, a deep groove ball bearing is adopted as the rolling bearing 10, but the present invention can also be applied to other forms of rolling bearings 10. For example, FIG. 7 shows an embodiment in which a tapered roller bearing is adopted as the rolling bearing 10.

  In this embodiment, the seal ring 5 is attached between the large collar of the inner ring 1 and the large-diameter side end of the inner diameter surface of the outer ring 2. Here, the outer ring 2 is stationary, the inner ring 1 is the rotation side, and the seal ring 5 is fixed to the outer ring 2 that is the fixed side by fitting or the like. The seal ring 5 is fixed to the inner ring 1 that is the rotation side. It can also be fixed by fitting or the like. In FIG. 7, the outer diameter side end 7 of the seal ring 5 is fixed by fitting to the outer ring 2 that is the fixed side, and the inner diameter side end 8 of the seal ring 5 is in sliding contact with the inner ring 1 that is the rotation side. It has become.

  In FIG. 7, the seal ring 5 with the filter part F is provided only in the axial opening on one side, but the filter part F is also provided in the axial opening on the opposite side as in the case of FIG. An attached seal ring 5 may be provided. Since various aspects of the filter part F and the through-hole 6 and various forms of the flocked part 20 are the same as those in the above-described embodiment, description thereof will be omitted.

  Furthermore, in the case of a rolling bearing provided with a foreign matter detection device that detects foreign matter made of metal such as iron powder in the lubricating oil, the conductive fiber is used as the sensor electrode of the foreign matter detection device. The flocked part 20 can be used.

  For example, as shown in FIG. 8, the flocked portion 20 used as an electrode of the foreign object detection sensor is configured of a conductive fiber and includes a first flocked portion 32 and a second flocked portion 33 that are separated from each other. can do.

  In addition, the foreign object detection device uses the first and second hair implanted parts 32 and 33 as electrodes, and the electric circuit C extending from the both electrodes to the power source P, and adhesion of foreign substances between the electrodes. And a control device 30 that detects the state of the foreign matter contained in the lubricating oil by detecting a change in the electrical output of the accompanying electric circuit C. On the wiring of the electric circuit C, a fixed resistor can be arranged as necessary. Further, the wiring 31 can be constituted by plating or the like applied to the seal ring 5 with gold, silver, copper, or other metal.

  A foreign substance made of metal adheres between the first flocked portion 32 and the second flocked portion 33, and the pair of electrodes facing each other is electrically short-circuited, so that the resistance value between the electrodes becomes small. Generally, the resistance value is large because the cross-sectional area of the portion through which current can pass is small when the amount of foreign matter is small, and the resistance value is small because the cross-sectional area of the portion through which current can pass is large when the amount of adhesion is large Become. For this reason, a threshold value is provided in advance in the output voltage, and the control device 30 may be set so as to determine that the rolling bearing 10 is in an abnormal state when the electrical output becomes equal to or less than the threshold value.

  At this time, it is possible to adjust the detection characteristic at the time of detecting a foreign material by increasing / decreasing the thickness and length of the fiber of the flocked part 20. The smaller the fiber thickness of the flocked part 20 is, or the longer the fiber length is, the greater the change in electrical output when a foreign object adheres between the electrodes. It becomes easy.

  In addition, both the electrodes of the 1st flocked part 32 and the 2nd flocked part 33 are separated and arrange | positioned mutually spaced apart, and between both electrodes of the 1st flocked part 32 and the 2nd flocked part 33, it is from metal. The presence / absence of foreign matter contained in the lubricating oil may be determined by detecting the presence / absence of conduction as to whether electricity is flowing through the foreign matter. If there is no continuity, it can be seen that the foreign matter is not short-circuited between the electrodes, and if there is continuity, the foreign matter is short-circuited between the electrodes.

  In the above embodiment, the filter portion F is provided in the seal ring 5 that covers the axial opening of the bearing space of the rolling bearing 10, but the place where the filter portion F is provided may be other than the seal ring 5. For example, a filter part F capable of capturing foreign matter may be provided in the middle of the distribution route of the lubricating oil, and the flocked part 20 having the above-described configurations may be provided on the filter part F.

  In the above embodiment, the content of the present invention has been described by taking a deep groove ball bearing or a tapered roller bearing as an example of the rolling bearing 10. You may employ | adopt the structure of the flocking part 20. FIG.

DESCRIPTION OF SYMBOLS 1 Inner ring 2 Outer ring 3 Rolling body 4 Cage 5 Seal ring 6 Through-hole 6a Inner surface 20 Flocked portion 21 Inner surface flocked portion 22 One side flocked portion 23 Other side flocked portion 30 Controller 31 Wiring 32 First flocked portion 33 Second flocked portion C Electric circuit F Filter part P Power supply

Claims (11)

An inner ring and an outer ring,
A rolling element disposed in a bearing space between the inner ring and the outer ring;
A filter portion that allows passage of lubricating oil between the inside and outside of the bearing space and prevents passage of foreign matter; and
A flocked portion provided in the filter portion;
Rolling bearing with The rolling bearing according to claim 1, wherein the flocked portion is provided on an inner surface of a through hole provided in the filter portion. The filter part is a mesh member in which the through holes are formed by connecting wire rods in a lattice shape,
The rolling bearing according to claim 1 or 2, wherein the flocked portion is provided on a wire of the mesh member. The filter unit includes a plurality of sizes of through holes having different inner diameters,
The rolling bearing according to any one of claims 1 to 3, wherein the flocked portion is provided only in a through hole having a predetermined inner diameter or more. The rolling bearing according to any one of claims 1 to 4, wherein a fiber length of the flocked portion is set to be longer than an inner diameter of a through hole provided in the filter portion provided with the flocked portion. The rolling bearing according to any one of claims 1 to 5, wherein a planting direction from a root part to a tip part of a fiber of the flocked part is perpendicular to a direction in which a through hole provided in the filter part extends. The planting direction from the root part to the tip part of the fibers of the flocked part is inclined to the downstream side in the flow direction of the lubricating oil with respect to the direction in which the through hole provided in the filter part extends. The rolling bearing according to one. The rolling according to claim 2, wherein the flocked portion is provided on a surface facing the bearing space around the through hole and / or a surface facing the outside of the bearing space around the through hole, or a surface on either side thereof. bearing. The rolling bearing according to claim 1, wherein static electricity or magnetism is attached to the fibers of the flocked portion. The rolling bearing according to claim 1, wherein an oiling agent is applied to the fibers of the flocked portion. The flocked portion includes a first flocked portion and a second flocked portion made of electrically conductive fibers,
An electrical circuit in which the wiring extends from both electrodes to the power source with each of the first hair transplant part and the second hair transplant part as electrodes,
A control device for detecting the state of the foreign matter contained in the lubricating oil by detecting a change in electrical output of the electric circuit accompanying the adhesion of the foreign matter between the electrodes;
The rolling bearing according to claim 1, comprising:

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